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Ribbon representations of LC, HN and LC-HN predicted from the structure of BoNT/A (Protein Data Bank file: 3BTA). The N- and C-terminal ends are indicated (NH2 and COOH) for each protein. The Trp residues are represented as blue spheres for the three proteins and indicated in C as W43, W118 and as W460, W606, W706 and W717 for HN.
